Table 3.

Results of Poisson Multiple Regression Analysis Comparing Return Visits per Enrollee Month by Access Assured Members in 0% and 100% Discount Groups

Return Visits per Enrollee Month (Excluding First Visit)Incidence Rate Ratio (95% CI)P*Estimated Mean Return Visit Rate† (95% CI)
Discount level (%)
    01.00‡—0.32 (0.29–0.34)
    1001.12 (0.97–1.30).1180.35 (0.31–0.40)
Age (years)1.007 (1.002–1.012)§.006—
    25——0.30 (0.26–0.34)
    50——0.36 (0.33–0.39)
    75——0.43 (0.35–0.50)
Sex
    Male1.00‖—0.30 (0.26–0.33)
    Female1.26 (1.10–1.45).0010.37 (0.34–0.41)
Clinic
    Gabriel Park1.00—0.29 (0.25–0.33)
    South Waterfront1.31 (1.12–1.54).0010.38 (0.35–0.41)

  • All results are adjusted for each of the covariates listed in the first column.

  • * P values were obtained by the Wald χ2 test for Poisson regression.

  • † Estimated mean return visit rates were calculated while holding covariates constant at their average values.

  • ‡ Reference group is the 0% discount level.

  • § Incidence rate ratio is for every 1-year increase in age.

  • ‖ Reference group is men.

  • Reference group is the Gabriel Park clinic.